Receptacle or tank for the storage of compressed air



(No Model.) v I W TIMMIS.

RBGEPTAGLE ORTAN'K FOR THESTORAGE 0P COMPRESSED AIR, GAS, 850; N0. 517,777. I Patented Apr. 3, 1894.

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1 UNITED STATES PATENT ;OFFICE.

WILLIAM TIMMIS, OF PITTSBU RG, PENNSYLVANIA.

RECEPT'ACLE R T ANK FOR THE STORAGE 0F COMPRESSED AIR, GAS, 8L0.

SPECIFICATION forming part of Letters Patent No. 517,777, dated April 3, 1894.

Application filed January 25, 18 94 Serial No. 49 1 (N 111011611) To all. whom it may concern.-

Be it known that 1, WILLIAM T1MMIs,acitizen of the United States of America, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Receptacles or Tanks for the Storage of Compressed Air, Gases,&c.; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters of reference marked'thereon, which form a part of this specification.

This invention relates to improvements in tanks for the reception and storage of air, gas

or liquid under heavy pressure, the object of the same being to provide a tank that will be tight and strong.

In theaccompanying drawings,forming part of this specification, Figure 1 is a longitudinal sectional view of the improved storage tank, and Fig. 2 is a transverse sectional view.

In carrying out my invention I make use of two cylinders or casings, A and B, placedone within the other and of such relative size that a comparatively small space is left between them which completely surrounds the inner casing.

The inner casing B is provided with lugs 1) which are formed integral therewith or attached thereto in any suitable manner and are adapted to contact at suitable points with the outer cylinder or casin g A to properly position the innercylinder or casing within. the same. The cylinders or casings are provided with heads secured thereto in the usual manner, preferably by rivets, the edges of the metal where they join being also connected by rivets. I a p O and D designate stay-rods which extend 7 through both cylinders or casings.

After the cylinders have been placed one within the other the head of, the outer cylinder is secured in place, and this head is provided with an opening around which is riveted a plate having a corresponding opening. After the casing has been assembled they are then placed in a furnace and heated to a very high temperature, and when in. this heated condition molten lead or equivalent soft metal is poured through the opening in the head of the outer casingv so as to completely fill the space between the two casings. When the casings cool the walls thereof will contract so as to fill up the pores'of the metal and every opening or joint through which leakage might otherwise take place.

It isa well-known fact that gases and air may be compressed to such an extent that the ordinary storage tank made up of sheet steel and joined with rivets is not sufiiciently tight to prevent leakage, and consequently with such tanksorreceptacles there is a constant diminishingof the pressure,and it is also known that such tanks when they burst from excessive pressure break into many small pieces 'whichare liable to do great injury. With a storage tank constructed in accordance with my invention the leakage is reduced to a minimum and the inner and outer casings being intimately connected to each other by the soft metal are able to withstand great pressure so that in case of an explosion there will be a mere rupture analogous to that which takes place with a copper boiler, thus greatly reducing the danger which accompanies the use of gas or air under heavypressure.

The tank though-especially adapted to receive compressed air may be used for many other purposes. And the inner and outer casings may be made of any shape or configuration, that employed for steam boilers being the preferable form.

I am aware it has been proposed to coat the inner sides ofa vessel with vitreous enamel for the purpose of covering the interior seams and joints of the vessel; also that it is not new to make storage vessel of galvanized sheet metal, or to apply molten metal to the exterior of the joints where the heads are convnected to the body portion, but

What I claim as new, and desire to secure by Letters Patent, is-

l. A receptacle made up of inner and outer metallic casings placed one within the other so as to leave a space between them, the space 7 being filled by a metal of greater density than the metal of which the casings are made.

2. As an improved article of manufacture, a tank or receptacle made up of two metallic casings of different sizes one placed within the they are in aheated condition filling the space other to leaveaspace between then1,said space between them with molten metal of greater being filled with a ductile metal of greater density than the metal of which the casings density than the metal of which the casings are made, substantially as described. 15 5 are made so as to completely surround the in- In testimony whereof I affix my signature in ner casing and connect the same to the outer presence of two witnesses. casing, substantially as shown, and for the purpose Set forth. WILLIAM TIMMIS.

3. A method of manufacturing metallic re- Witnesses: l0 ceptacles consisting in placing one casing G. S. ELLIOTT,

within another, heating the casings and while E. W. JOHNSON. 

